"N° 69 (OBP) ""50c. lilac brown - white smoke - bilingual 1915"" on registered cover sent from Stanleyville April 21, 1917 to Paris, France and forwarded to St. Adresse where it arrived June 13th, 1917, via Leopoldville and Paris Etranger, vf " (Image)

Postal stationery Stibbe n° 45, sent from Bumba October 18th, 1916 to London, where the cancellation was applied on the stamp, folded, vf/f. (Image)